Spring-tire for vehicles.



S. R. CREWS.

SPRING TIRE FOR VEHICLES..

ABPLIGATION FILED SEPT. z, 1911.

1,030,233.,l Patented June 18, 1912.

43@ ATTORNEYS 'UNITED STATES .PATENT OFFI STEPHEN Ross caEWs, or TAMPA,rLoRrnA, AssIGNoR or ONE-HALF To JosIAH.

RICHARDSON, oF TAMPA, FLORIDA.

SPRING-TIRE FOR VEHICLES.

Specicatiion of Letters I'tent,

Patented June 18, 1912.

are as hereinafter described and illustratedv in the'accornpanyingdrawing, in whichw l Figure 1 is in part aside view and in part asection of a portion of the wheel embodying my invention. Fig. 2 is atransverse section on the line 2-2 of Fig. 1. Fig. 3 is a perspectiveView of the square transverse bolt to which the inner end of the coiledspring forming a part otthe invention is secured. Fig. 4 is aperspective view of one of the springs. Fig. 5 is a side view of aAportion of: one of the annular side plates. Y

The wheel rim, regarded as a whole, is formed in two parts, one, A,being Xed concentrically with the hub of the wheel, and the other,annular part, B,.being movable radially on the part A', Between thesetwo parts A and B, and attached to both, are arranged a series of coiledsprings C. The details of construction, arrangement, and combination areas follows: The part A is formed of a wood or iron felly 1 secured onthetenons of spokes. A .steel rim 2 encircles such felly, and a layer-or strip of rubber or some other equivalentmaterial is laid upon theband.- Upon this layer or packing 3 are secured ythe fiat inner ends ofShanks of the coiled springs C, by means of screw-bolts 4. The outerpart B or rim proper is formed of an elastic solid tread 5 and parallelside plates 6 which are secured to the flanges of a rim 7 upon which-theelastic tread is laid. The metallic rim 7 is secured to the side plates(3 by means of transverse .bolts 10. The latter thus constitute thesides of the rim part B and their inner edges extend inward over aportion of I the sides of .the wooden tellyl land are adapt-ed to slideradially thereon and also, slig tly circumferentially so far aspermitted by the elasticity of the spring For the purpose of impartinggreater strength to the side plates 6, they have one or morecircumferential crimps gr corruga tions. It is apparent that the part Bforms a circular trough-like inclosure for the immovable rim portion ofthe wheel, and is adapted to slide bodily in a radial direction,

that is to say, toward or from the wooden' felly 1 and also adapted forslight circumferential movement thereon. I am thus enabled to apply apunctureless tire having the same elastic quality as the more experisivepneumatic tires now generally used.

The outer ends of the 'coiled springs C are formed, as shown in Fig. 4,with a thickened part 9 having'a square opening adapted vto receive thesquared portion of a bolt 10- `see Fig. 3. The ends of said bolt are re#duced and one is screw-threaded to receive a nut 12. The other endl 13of the bolt is squared and. adjacent to it is a reduced round portion14, and between such parts 13 and 14 is a reduced squared portion 15. By

rotating the bolt-s 10,'1 the tension of. the l' v'springs C may ,bechanged at will. To effect this, a wrench-ds applied to the bolt head13,and another' to nut 12, which is thus rotated until rr moved, whichpermit-s the bolt to be adjusted with the round part 14 in the squarehole in the rim adjacent plate 6. Then the bolt is rotated andreadjusted so that its squared portion 15 again enters the'correspondingaperture in the rim plate.

Ina spring Wheel of the type indicated, the combination, with a fixedinner wheel rim and an outer concentric movable rim including parallel,annular, lside plates eX- tending radially inward and overlapping thefixed" rim, said plate-s being provided with a series of polygoi'ialapertures, oi coiled springs interposed between the two rims and securedto the inner one, polygonal bolts passingtransversely through the freeends'otthe springs,l said bolts having two adjacent squared portions anda reduced rounded portion at one end, and a screw tenon at the otherend, the inner one of the adjacent squared portions being adapted to fitin the polygonal apertures of the side plates, whereby the bolts areadapted 5 to be adjusted lengthwise and rotated when it is required tochange the tension of the springs, but in normal position and re `lationlock the springs With-the side plates and hold them under any requireddegree of tension, substantially as described.

STEPHEN ROSS CREWS. lVitnesses DozmR A. DE VANE, EVA EMERSON.'

